01 March 2015

Bumping along

Reference AIM MET 3.7 Turbulence Reporting Criteria

Intensity:
  • light
    • turbulence: momentary, slight changes in altitude/attitude
    • chop: slight, rapid, rhythmic bumpiness without appreciable changes in altitude/attitude
  • moderate
    • turbulence: greater than light, aircraft remains in positive control, variations in IAS
    • chop: greater than light, rapid bumps/jolts without appreciable changes in aircraft altitude/attitude
  • severe
    • large, abrupt changes in altitude/attitude
    • large variations in IAS
    • momentary loss of control

Frequency:
  • occasional (<1/3 of the time)
  • intermittent
  • continuous (>2/3 of the time)

Report:
  • location
  • time
  • intensity
  • in or near cloud
  • altitude
  • type of aircraft
  • duration (if applicable)
High level turbulence not associated with cumuliform clouds should be reported as CAT.

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